## 抄録

The phonon-dispersions of PbWO_{4} crystal are calculated using the first-principles calculations. Polarized Raman spectra in the PbWO_{4} were measured in the temperature range from 4 K to 280 K, and the temperature dependence of the linewidth of the E_{g} (193 cm^{-1}) and A_{g} (906 cm^{-1}) Raman modes was analyzed using both the first-principles calculations and lattice perturbative approach. We found that the different behaviors of these two modes in the case of temperature broadening could be attributed to the large energy band gap in the PDOS (one-phonon density of states) resulting in different anharmonic interactions. The ratio of up-conversion TDOS (temperature-weighted two-phonon density of states) to down-conversion TDOS for E_{g} mode (193 cm^{-1}) is more than that for A_{g} (906 cm^{-1}). Therefore, the linewidths for the E_{g} mode (193 cm^{-1}) may be varied with increasing temperature by comparison with those of the A_{g} (906 cm^{-1}).

本文言語 | English |
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ページ（範囲） | 36-41 |

ページ数 | 6 |

ジャーナル | Solid State Communications |

巻 | 192 |

DOI | |

出版ステータス | Published - 2014 8月 |

## ASJC Scopus subject areas

- 化学 (全般)
- 凝縮系物理学
- 材料化学

## フィンガープリント

「Phonon anharmonicity of phonon band gap effect of scheelite PbWO_{4}studied by Raman spectrometry and first-principles calculations」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。